An age-progression photo depicts Timmothy Pitzen as a 13-year-old.(Photo: National Center for Missing and Exploited Children)

Mother Amy Fry-Pitzen found dead

His mother, Amy Fry-Pitzen, pulled Timmothy from his kindergarten class for a family emergency one day before the disappearance, according to a Chicago-based CBS affiliate. But no family emergency existed, and Fry-Pitzen accompanied her son on a trip to the Wisconsin water park and a zoo in Brookfield, Illinois, a suburb of Chicago.

His mother was later found dead in a Rockford, Illinois, hotel.

A note left behind stated Timmothy would never be found, but that he was safe and being cared for by a loved one, according to CBS Chicago.

Father Jim Pitzen shares memories

Timmothy Pitzen's father, Jim Pitzen, shared memories of his son with mystateline.com in 2017.

Timmothy was a kindergarten student at Greenman Elementary School in Aurora, and Pitzen recalled the last time he saw his son, running toward a teacher before school.

Timmothy had hopped out of his father's Jeep and told his dad he loved him.

Cheryl Broach, Timmothy's teacher, told mystateline.com that she suspected something might have been amiss when Timmothy's mother didn't give her forewarning that she'd be pulling Timmothy from school.

"He walked down with his backpack on, and he turned at the clock and waved, 'See you tomorrow.' I said, 'See you, Timmothy,' and he walked (away), and I would never see him again," Broach said.

Pitzen said Amy Fry-Pitzen adored her son, and that he was the "one person she would never do anything to."

"It's terrifying, not knowing where he's at," Pitzen said in 2017. "I keep hoping everyday that he comes home."

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